Vocabulary
What is the smallest building block of matter?
What is an atom?
Substances have different properties because they are made of different groups of ______.
What are atoms?
A group of two or more atoms bonded together is called a ______.
What is a molecule?
What does a model help us do in science?
What is visualize or explain something we cannot directly see.
The temperature at which a substance changes from solid to liquid is called the ______.
What is melting point?
What is the process in which substances rearrange to form new substances?
What is a chemical reaction?
Groups of atoms repeat to make up a ______.
What is a substance?
What do molecules combine to form?
What is Substances?
What does the subscript in Hâ‚‚O tell us?
What is the number of atoms of that element?
A characteristic of a substance that can be observed or measured is called a ______.
What is property?
What is a representation scientists use to study things too small to see?
What is a model?
Why do scientists use models in studying chemical reactions?
What is things can be too small or too large to see.
In water (Hâ‚‚O), how many hydrogen atoms are there?
What is 2?
Which model tool shows how substances rearrange in a reaction?
What is a chemical reaction simulation or reaction model?
Give one example of a physical property.
What is Color, density, melting point, etc?
What is the written way of showing the atoms in a substance (like Hâ‚‚O)?
What is a chemical formula?
When the type or number of atoms in a group changes, what happens?
What is the substance changes.
True or False: Atoms can be destroyed in a chemical reaction.
What is false? (they only rearrange)
How is a chemical formula different from a model drawing?
What is a formula uses letters/numbers, a model shows pictures of atoms.
How can you tell a chemical reaction has happened?
What is a new substances with different properties are formed.
What are the substances you start with in a chemical reaction?
What are reactants?
Different substances have different ______.
What is properties?
Which has more atoms: COâ‚‚ or Hâ‚‚Oâ‚‚?
What is Hâ‚‚Oâ‚‚? (4 atoms)
Which formula shows one carbon atom and four hydrogen atoms?
What is CHâ‚„ (methane)?
When two substances combine and bubbles form, what does this show?
What is a chemical reaction has occurred?